Lost River Gorge

Lost River Gorge and Boulder Caves is one of the most unusual natural attractions in New Hampshire’s White Mountains — a steep, narrow gorge in Kinsman Notch where a mountain stream tumbles down and repeatedly disappears beneath, and reappears among, an enormous jumble of granite boulders. The ‘lost’ river vanishes into the rocky chaos, giving the gorge its name.

A network of boardwalks, stairways and ladders descends through the gorge alongside the cascading water, with the adventurous able to squeeze through a series of named boulder caves — tight passages between and beneath the giant rocks, like the famous Lemon Squeezer. Set in a cool, mossy, forested glen in the White Mountain National Forest, Lost River Gorge is a beloved and quirky natural icon of New Hampshire.

Lost River Gorge is explored on a boardwalk-and-stairway trail that descends through the gorge beside the cascading, disappearing stream, with the option to crawl and squeeze through a series of boulder caves (tight passages like the Lemon Squeezer between and beneath the giant rocks — cave exploration is optional and can be skipped on the boardwalk). The site has nature gardens, a suspension bridge and forest paths. Walking the gorge boardwalk and squeezing through the boulder caves are the signature draws. The combination of a disappearing river, giant boulder caves and a cool mossy gorge makes Lost River uniquely fun.

Lost River Gorge is open seasonally, roughly from May through October, with summer bringing lush green and full flow (and the warmest cave-crawling), and fall bringing beautiful foliage in Kinsman Notch. The gorge is cool and shaded even on hot days, and the stream is fullest in spring and after rain. Summer and fall are the highlights — come on a warm day to enjoy the cool gorge and the boulder caves, reserve or check hours in peak season, and wear clothes you don’t mind getting muddy if you crawl the caves.

The boulder caves of Lost River were, by tradition, discovered in the 1850s when two brothers fishing in Kinsman Notch found the stream disappearing among the boulders. The gorge became a popular attraction, and the land was protected by the Society for the Protection of New Hampshire Forests, which has long operated it as a conservation-minded attraction within the White Mountain National Forest setting. Generations have explored its boardwalks and caves. Lost River Gorge preserves this quirky natural wonder and its cool, forested glen, a treasured icon of New Hampshire.

Lost River Gorge formed where a mountain stream cut down through the granite of Kinsman Notch and, crucially, where enormous granite boulders — broken from the steep gorge walls by freeze-thaw and the work of Ice Age glaciers — tumbled into the narrow ravine, piling up to create the maze of boulder caves. The stream threads down through and beneath this jumble, disappearing and reappearing among the giant rocks. The granite, the glacial and freeze-thaw breakup of the walls, and the boulders filling the gorge created the boulder caves and the ‘lost’ river.

The cool, mossy gorge and the surrounding White Mountain forest of Kinsman Notch host the wildlife of the Whites — black bears, moose and deer in the woods, beavers in the streams, and a birdlife of boreal species and woodpeckers — while the shaded gorge shelters mosses, ferns, amphibians and the cool-loving life of the damp rocks, and the stream holds trout. The gorge’s damp microclimate supports lush plant life. While visited for its caves and water, the gorge and surrounding forest offer glimpses of White Mountain wildlife in a cool, green setting.

Lost River Gorge shelters a cool, moist microclimate where shade and spray nourish lush mosses, ferns and shade-loving plants among the boulders, within the spruce-fir and hardwood forest of Kinsman Notch. The damp gorge supports specialized plant communities, and the site is managed with a conservation ethic by the Forest Society. The fragile mosses and the gorge environment are sensitive to disturbance. Protecting the stream, the boulder gorge and the surrounding forest sustains both the ecology and the cool, green beauty of Lost River Gorge.

Lost River Gorge holds a treasured and quirky place among the icons of New Hampshire — a wild jumble of granite boulder caves and a disappearing river in Kinsman Notch, a beloved White Mountains attraction since the 1850s, long protected and operated with a conservation ethic. Its boardwalks and squeezable caves have delighted generations. The gorge embodies the playful, rugged side of the White Mountains. Lost River Gorge is a cherished natural icon of New Hampshire.

Lost River Gorge is in Kinsman Notch in the White Mountains of New Hampshire, on Route 112 (the western end of the Kancamagus region) west of North Woodstock, about two and a half hours north of Boston. The site is operated as a seasonal attraction (admission fee) by the Society for the Protection of New Hampshire Forests, open roughly May through October. It has the gorge boardwalk, boulder caves, gardens, a cafe and gift shop. The boardwalk involves many stairs; cave crawling is optional. Check Lost River Gorge for hours, admission and conditions before visiting.

The Society for the Protection of New Hampshire Forests operates and protects Lost River Gorge with a conservation ethic. Visitors help by staying on the boardwalks and designated cave routes, not damaging the fragile mosses and gorge environment, respecting the stream and wildlife, packing out everything, and following all rules. The lush mosses, the boulder caves and the gorge are sensitive to heavy use. Protecting the stream, the gorge and the surrounding forest sustains both the ecology and the cool, green beauty of this beloved gorge.

The gorge boardwalk has many steep stairs and can be wet and slippery — wear sturdy, non-slip shoes, hold the railings and take your time. The optional boulder caves involve tight squeezes, crawling, low ceilings and dark passages; skip any that feel too tight or if you have claustrophobia or mobility concerns, and watch your head. The gorge is cool (bring a layer) and the rocks are slippery. Supervise children. Respect the stairs, the slippery surfaces, the tight caves and the cool, wet conditions of the gorge.

Lost River Gorge is a seasonal attraction with an admission fee and set hours. Stay on the boardwalks and designated cave routes. The boulder caves are optional and have tight, low passages — enter at your own discretion and watch children. Do not damage the mosses, plants or formations. Pets may be restricted — check ahead. Drones are restricted. Pack out all trash. Follow all posted rules and staff guidance. Check Lost River Gorge for hours, admission, pet rules and conditions before visiting.

The towns of North Woodstock and Lincoln, Franconia Notch State Park, the Kancamagus Highway, the White Mountain National Forest, and the rest of the Whites lie near Lost River Gorge. Kinsman Notch and the White Mountains define the region. Lost River Gorge is a quirky highlight of the western White Mountains, a centerpiece of a New Hampshire adventure, easily combined with Franconia Notch, the Kancamagus Highway and the towns of Lincoln and North Woodstock.

Come on a warm summer day to enjoy the cool, shaded gorge, and wear sturdy, non-slip shoes and clothes you don’t mind getting muddy if you want to crawl through the boulder caves (the Lemon Squeezer and others are optional — skip them if tight spaces aren’t for you, and just enjoy the boardwalk). Hold the railings on the many wet stairs, bring a layer for the cool gorge, check the seasonal hours, and combine your visit with nearby Franconia Notch and the Kancamagus Highway.